Head of the School Electrical and Computer Engineering Programiii This is the dedicated to my parents Xingshan Yang and Huili Chu. Thanks for all your love and supports to my life. iv ACKNOWLEDGMENTS I would like to thank my major professor Jan P. Allebach for giving me the opportunity to work with him. Without his advice, help, encouragement, this research would not happen. I want to thank Prof. Michael D. Zoltowski helps and encourages me in my graduate program as well. I also would like to appreciate professor Joseph V. Rispoli gives me the sufficient skills and confidence from my starting of academic research. I sincerely thank PoshMark research team, especially Zhi Li, Litao Hu, and Zhenxun Yuan, they give me helpful and valuable advice to me in this research work.Also, I would like to thank all my friends and the EISL group. The encouragement and help they gave me is an essential part of completing my thesis master program.
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